Dorman M630402 Brake Master Cylinder

Reliable Brake Master Cylinder for Chevrolet Cobalt and Pontiac G5

The Dorman M630402 brake master cylinder is engineered to restore proper brake hydraulics in your Chevrolet Cobalt or Pontiac G5. Designed with precision, this master cylinder includes a reservoir and sensor to ensure consistent brake fluid management and system monitoring.

Key Features of the Dorman M630402 Brake Master Cylinder

• Master cylinder bore diameter of 0.875 inches for accurate hydraulic pressure
• Constructed from durable aluminum material for corrosion resistance and longevity
• Includes an integrated reservoir for brake fluid storage
• Equipped with a sensor to monitor brake fluid levels and system status
• Two outlets with M12 x 1.0 thread size for rearward and secondary connections

Detailed Product Description

The Dorman M630402 brake master cylinder is specifically designed for use in Chevrolet Cobalt and Pontiac G5 models, providing a direct replacement for the original equipment. Its aluminum construction offers a balance of strength and lightweight performance, while the 0.875-inch bore diameter ensures proper hydraulic pressure for effective braking. The included reservoir simplifies brake fluid management, and the integrated sensor supports vehicle monitoring systems by detecting fluid levels. With two outlets featuring M12 x 1.0 thread pitch, this master cylinder facilitates secure and reliable brake line connections.

Common Brake System Issues Addressed

• Brake pedal sinking or sponginess due to master cylinder wear
• Brake fluid leaks from a damaged or corroded master cylinder
• Warning lights triggered by faulty brake fluid level sensors
• Uneven braking performance caused by hydraulic pressure loss
• Replacement of original master cylinder in Chevrolet Cobalt or Pontiac G5

Installation Notes and Tips

When installing the Dorman M630402 brake master cylinder, ensure the brake system is properly bled to remove air and maintain hydraulic integrity. Verify that the sensor connector is securely attached to maintain accurate fluid level monitoring. Use compatible brake fluid as specified by the vehicle manufacturer. Note that mounting hardware is not included and should be reused or sourced separately if needed.

Quality Assurance and Warranty

Dorman brake master cylinders are manufactured to meet or exceed OEM specifications, providing reliable performance and durability. This product includes a limited warranty against defects in material and workmanship, ensuring confidence in your brake system replacement.